Novel mechanism of photoinduced magnetism in organic-based magnetic semiconductor V(TCNE)x, x∼2

Abstract

The organic-based magnet V(TCNE)x, x∼2 (Tc∼400K), is a room temperature magnetic semiconductor with spin polarized valence and conduction bands. It was reported that this material exhibits persistent photoinduced change in both magnetization and conductivity. The simultaneous change in IR spectra by illumination shows photoinduced activation to the metastable state with a small structural change. Here, we employed photoinduced ferrimagnetic resonance (FMR) study to investigate photoinduced magnetization in V(TCNE)x film. The FMR spectra display substantial changes in their linewidth and line shift by the illumination indicating substantial increase in random magnetic anisotropy. The results demonstrate optical control of magnetism by changing magnetic anisotropy of the system.